The Periodic Table

1. The Periodic Table Chapter 12 Preview CRCT Preparation

2. CRCT Preparation Chapter 12 1. What does the number at the top of the square above tell you about carbon? AA carbon nucleus has 6 protons. BCarbon has an average atomic mass of 6. CCarbon has 6 isotopes. DA carbon atom has 6 electrons in its outermost energy level.

3. CRCT Preparation Chapter 12 1. What does the number at the top of the square above tell you about carbon? A A carbon nucleus has 6 protons. BCarbon has an average atomic mass of 6. CCarbon has 6 isotopes. DA carbon atom has 6 electrons in its outermost energy level.

4. CRCT Preparation Chapter 12 2. Approximately how many elements are in the periodic table? Abetween 75 and 100 Bbetween 100 and 125 Cbetween 125 and 150 Dmore than 150

5. CRCT Preparation Chapter 12 2. Approximately how many elements are in the periodic table? Abetween 75 and 100 B between 100 and 125 Cbetween 125 and 150 Dmore than 150

6. CRCT Preparation Chapter 12 3. Alberto has an element that is a shiny, brittle solid that conducts electric current. The element most likely belongs to which class of elements? Ahalogens Bmetals Cnonmetals Dmetalloids

7. CRCT Preparation Chapter 12 3. Alberto has an element that is a shiny, brittle solid that conducts electric current. The element most likely belongs to which class of elements? Ahalogens Bmetals Cnonmetals D metalloids

8. CRCT Preparation Chapter 12 4. In what order are the regions arranged on the periodic table when you read it from left to right? Anoble gases, metals, nonmetals, metalloids Bmetalloids, metals, nonmetals, noble gases Cmetals, metalloids, nonmetals, noble gases Dnonmetals, noble gases, metals, metalloids

9. CRCT Preparation Chapter 12 4. In what order are the regions arranged on the periodic table when you read it from left to right? Anoble gases, metals, nonmetals, metalloids Bmetalloids, metals, nonmetals, noble gases C metals, metalloids, nonmetals, noble gases Dnonmetals, noble gases, metals, metalloids

10. CRCT Preparation Chapter 12 5. Fluorine, chlorine, bromine, iodine, and astatine make up Group 17, the halogens. Why are these elements grouped together? AThey are all very reactive nonmetals that have similar chemical properties. BThey are all nonreactive gases that have similar physical properties. CTheir atoms all have 8 electrons in their outer energy levels. DThey all have the same atomic number.

11. CRCT Preparation Chapter 12 5. Fluorine, chlorine, bromine, iodine, and astatine make up Group 17, the halogens. Why are these elements grouped together? A They are all very reactive nonmetals that have similar chemical properties. BThey are all nonreactive gases that have similar physical properties. CTheir atoms all have 8 electrons in their outer energy levels. DThey all have the same atomic number.

12. CRCT Preparation Chapter 12 6. Which of the following best describes the properties of metals? Ahard, brittle, and nonconductive Bliquid, dark, and conductive Cshiny, malleable, and conductive Dsoft, oily, and very reactive

13. CRCT Preparation Chapter 12 6. Which of the following best describes the properties of metals? Ahard, brittle, and nonconductive Bliquid, dark, and conductive C shiny, malleable, and conductive Dsoft, oily, and very reactive

14. CRCT Preparation Chapter 12 7. Which of the following statements about cobalt (Co) and nickel (Ni) is true? ANickel has a greater average atomic mass than cobalt does. BNickel atoms have more protons than cobalt atoms do. CCobalt atoms have more electrons than nickel atoms do. DCobalt and nickel belong to the same group on the periodic table.

15. CRCT Preparation Chapter 12 7. Which of the following statements about cobalt (Co) and nickel (Ni) is true? ANickel has a greater average atomic mass than cobalt does. B Nickel atoms have more protons than cobalt atoms do. CCobalt atoms have more electrons than nickel atoms do. DCobalt and nickel belong to the same group on the periodic table.

16. CRCT Preparation Chapter 12 8. Which of the following statements about a group of elements is true? AAtoms of the elements have the same number of neutrons. BAtoms of the elements have the same atomic number. CThe elements have similar properties. DThe elements have the same average atomic mass.

17. CRCT Preparation Chapter 12 8. Which of the following statements about a group of elements is true? AAtoms of the elements have the same number of neutrons. BAtoms of the elements have the same atomic number. C The elements have similar properties. DThe elements have the same average atomic mass.

18. CRCT Preparation Chapter 12 9. What is the purpose of the zigzag line on the right side of the periodic table? A It divides the metals and nonmetals and shows where the metalloids are. BIt indicates a group of elements that have the same chemical properties. CIt connects the elements in the table that have the same atomic number. DIt marks the border between the alkali metals and the transition metals.

19. CRCT Preparation Chapter 12 9. What is the purpose of the zigzag line on the right side of the periodic table? AIt divides the metals and nonmetals and shows where the metalloids are. BIt indicates a group of elements that have the same chemical properties. CIt connects the elements in the table that have the same atomic number. DIt marks the border between the alkali metals and the transition metals.

20. CRCT Preparation Chapter 12 10. In Mendeleev’s periodic table, the element iodine (I) came before tellurium (Te). He arranged the elements by atomic weight. Later, Henry Moseley revised the table to place iodine after tellurium. Explain the basis for Moseley’s revision to the periodic table.

21. CRCT Preparation Chapter 12 10. Answer - Full-credit answers should include the following: Moseley’s version of the periodic table is based on atomic number, not atomic mass. Some elements have higher atomic masses than the following element that has a higher atomic number. Therefore, some elements were rearranged when atomic numbers were discovered and used to organize the periodic table.

22. CRCT Preparation Chapter 12 11. Sodium and potassium are members of the alkali metal group. What properties do sodium and potassium share with each other and with the other members of the alkali metal group? Describe at least four properties.

23. CRCT Preparation Chapter 12 11. Answer - Full-credit answers should include at least four of the following points: • Members of the alkali metals are all metals and therefore are shiny and are good conductors. • Alkali metals are soft and can be cut with a knife. • Atoms of alkali metals have one electron in their outermost energy level. • Alkali metals have low densities. • Alkali metals are very reactive. • Alkali metals are silver in color.